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\section{How can elongation rates be predicted?}  \subsection{From morphological traits}  The length of the unbranched apical zone is correlated to the RER \cite{Various from Pagès&Draye2010}. More finely, the distance between the root tip and the zone of root hair development.  \cite{(Pagès&Draye2010}  Pagès L, Serra V, Draye X, Doussan C, Pierret A. 2010. Estimating root elongation rates from morphological measurements of the root tip. Plant and Soil 328, 35–44.